#include <iostream>
#include <string>
#include <mysql/mysql.h>

const std::string host = "127.0.0.1";
const std::string user = "connector";
const std::string passwd = "@Lhq123456";
const std::string db = "conn";
const unsigned int port = 3306;

int main()
{
    // std::cout << "mysql client version : " << mysql_get_client_info() << std::endl;

    MYSQL* my = mysql_init(nullptr);

    if (my == nullptr)
    {
        std::cerr << "init MySQL error" << std::endl;
        return 1;
    }

    if (mysql_real_connect(my, host.c_str(), user.c_str(), passwd.c_str(), db.c_str(), port, nullptr, 0) == nullptr)
    {
        std::cerr << "connect MySQL error" << std::endl;
        return 2;
    }

    mysql_set_character_set(my, "utf8");

    std::string sql = "select * from user";
    int n = mysql_query(my, sql.c_str());
    if (n == 0) std::cout << sql << "  success  " << std::endl;
    else
    {
        std::cout << sql << "  failed  " << std::endl;
        return 3;
    }

    MYSQL_RES* res = mysql_store_result(my);
    if (res == nullptr)
    {
        std::cerr << "mysql_store_result error" << std::endl;
        return 4;
    }

    // "这个res有点像句柄"
    my_ulonglong rows = mysql_num_rows(res);
    my_ulonglong fields = mysql_num_fields(res);

    std::cout << "行: " << rows << std::endl;
    std::cout << "列: " << fields << std::endl;

    // 属性
    MYSQL_FIELD* fields_array = mysql_fetch_fields(res);
    for (my_ulonglong i = 0 ; i < fields ; i++)
    {
        std::cout << fields_array[i].name << "\t";
    }
    std::cout << std::endl;

    // 内容
    for (my_ulonglong i = 0 ; i < rows ; i++)
    {
        MYSQL_ROW row = mysql_fetch_row(res);
        for (my_ulonglong j = 0 ; j < fields ; j++)
        {
            std::cout << row[j] << "\t";
        }
        std::cout << std::endl;
    }

    // std::string sql;
    // while (true)
    // {
    //     std::cout << "MySQL >>> ";
    //     if (!std::getline(std::cin, sql) || sql == "quit") 
    //     {
    //         std::cout << "bye bye" << std::endl;
    //         break;
    //     }

    //     int n = mysql_query(my, sql.c_str());
    //     if (n == 0)
    //     {
    //         std::cout << sql << "  success: " << n << std::endl;
    //     }
    //     else
    //     {
    //         std::cerr << sql << "  failed:  " << n << std::endl;
    //     }
    // } 
    
    // std::cout << "connect success" << std::endl;

    mysql_free_result(res);
    mysql_close(my);

    return 0;
}